New Yahoo update popup won't go away in Firefox
When I access the Yahoo.com website specifically "My Yahoo" web page I get a large popup across the entire lower screen on my PC that asks me if I want to try the "new Yahoo" update. When I click the button to try the update nothing happens the popup disappears for a second then comes back. If I decline the update the popup disappears until I change the page then it also comes back. What can I do to either get rid of the popup or actually try the new version nothing seems to work. I deleted all extensions and that didn't help. I also deleted the cache and that didn't work either. This popup is extremely annoying. Funny thing when I used Microsoft Edge for the same Yahoo page there was no popup. This popup does not appear to be malware but from Yahoo. Any help would be appreciated. I have attached a screenshot of the popup.